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Loans Held for Sale (Details Narrative) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Loans Held For Sale |  |  |
Provision on current loan originations | [1] | $ 1,078,812 | $ 2,211,230
Loan increase per point |  | $ 319 | $ 390
Amount of loan increased, per point |  | $ 1,000,000 | $ 1,000,000
[1] | Included in Mortgage fee income

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- Definition Amount of Loan Increased Per Point. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Loan Increase Per Point. + References No definition available. + Details
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Namespace Prefix: | SNFCA_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Provision on current loan originations. + References No definition available. + Details
Name: | SNFCA_LoanLossReserveProvisionsForLoss
Namespace Prefix: | SNFCA_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration